// --------------------------------------------------------------------------
// Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// Neither the name of the Drew Davidson nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.
// --------------------------------------------------------------------------
package com.feilong.lib.ognl;

import com.feilong.lib.ognl.enhance.OrderedReturn;
import com.feilong.lib.ognl.enhance.UnsupportedCompilationException;

/**
 * @author Luke Blanshard (blanshlu@netscape.net)
 * @author Drew Davidson (drew@ognl.org)
 */
public class ASTVarRef extends SimpleNode implements NodeType,OrderedReturn{

    /**
     * 
     */
    private static final long serialVersionUID = 8421017529924242773L;

    private String            _name;

    protected Class           _getterClass;

    protected String          _core;

    protected String          _last;

    public ASTVarRef(int id){
        super(id);
    }

    public ASTVarRef(OgnlParser p, int id){
        super(p, id);
    }

    void setName(String name){
        this._name = name;
    }

    @Override
    protected Object getValueBody(OgnlContext context,Object source) throws OgnlException{
        return context.get(_name);
    }

    @Override
    protected void setValueBody(OgnlContext context,Object target,Object value) throws OgnlException{
        context.put(_name, value);
    }

    @Override
    public Class getGetterClass(){
        return _getterClass;
    }

    @Override
    public Class getSetterClass(){
        return null;
    }

    @Override
    public String getCoreExpression(){
        return _core;
    }

    @Override
    public String getLastExpression(){
        return _last;
    }

    @Override
    public String toString(){
        return "#" + _name;
    }

    @Override
    public String toGetSourceString(OgnlContext context,Object target){
        Object value = context.get(_name);

        if (value != null){

            _getterClass = value.getClass();
        }

        context.setCurrentType(_getterClass);
        context.setCurrentAccessor(context.getClass());

        context.setCurrentObject(value);
        //context.setRoot(context.get(_name));

        if (context.getCurrentObject() == null){
            throw new UnsupportedCompilationException("Current context object is null, can't compile var reference.");
        }

        String pre = "";
        String post = "";
        if (context.getCurrentType() != null){
            pre = "((" + OgnlRuntime.getCompiler().getInterfaceClass(context.getCurrentType()).getName() + ")";
            post = ")";
        }

        if (_parent != null && ASTAssign.class.isInstance(_parent)){
            _core = "$1.put(\"" + _name + "\",";
            _last = pre + "$1.get(\"" + _name + "\")" + post;

            return _core;
        }

        return pre + "$1.get(\"" + _name + "\")" + post;
    }

    @Override
    public String toSetSourceString(OgnlContext context,Object target){
        return toGetSourceString(context, target);
    }
}
